"The WHO advises within 60 days we must ensure 70% of infected people are in a care facility and 70% of burials are done without causing further infection," said Anthony Banbury, the UN's deputy ebola coordinator.

Video:'10,000 New Ebola Cases Per Week'

"We need to do that within 60 days from 1 October. If we reach these targets then we can turn this epidemic around."

But Mr Banbury told the UN Security Council the 70% target was becoming harder to meet as new infections stack up.

He urged: "We either stop ebola now or we face an entirely unprecedented situation for which we do not have a plan."

The UN's Unmeer emergency mission is following a four-pronged plan to fight ebola.

The World Health Organisation (WHO) earlier said there could be 10,000 new cases of ebola per week within two months.

WHO assistant director general Bruce Aylward told a news conference the total was expected to top 9,000 by the end of this week.

He said the death rate from the current outbreak had risen to 70% from about 50%.

When asked how the situation could develop in the next two months, he warned: "We anticipate the number of cases occurring per week by that time to be somewhere between 5,000 and 10,000 per week.

Video:On Board Ebola Ship RFA Argus

"It could be higher, it could be lower, but somewhere in that ball park."

Some 95% of the cases are occurring in the same limited number of districts of Liberia, Sierra Leone and Guinea which were affected a month ago, he said.

Dr Aylward said it was "too early to say" whether this meant that the epidemic was slowing down.

The plateau in reported infections may simply be due to limitations in the ability of authorities in the region to check and record cases, he said.

Dr Aylward said there were "positive" signs of a slow down in the rate of new cases in northern Liberia and Guinea, probably due to behaviour changes among the local population.

Video:Oct 14: Ebola Special Report

But he warned: "This is ebola, this is a horrible, unforgiving disease - you've got to get to zero.

"With a bit of change in the behaviour of populations, with some burials happening safely, with a little bit more case management and a couple of new centres opening, you are going to slow this down very quickly."